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Increasing the LGWR priority is putting the LGWR process in the Round-Robin (SCHED_RR) class. You can increase process’s priority both using OS (renice, nice commands) or Database methods, but this post is about setting the priority using ‘_high_priority_process’ an undocumented/hidden parameter that prioritizes your database managed processes.

I am using Oracle 19.3 for the test where the LGWR is not by default comes with any priority in the DB, starting from 21.3.0.0.0 LGWR process is part of _high_priority_processes group along with VKTM & LMS* processes.Note: This being a hidden/undocumented parameter I advise to consult with Oracle support before going and changing the parameter value. Try other possible ways to reduce log file sync, before jumping into this crude method of prioritizing LGWR over others.

And by default in Oracle version 19.3.0.0 the parameter is set to prioritize VKTM (Virtual keeper of time) and LMS (Lock Manager, a RAC process). Let me check VKTM’s current priority class, and it is set to RR class (SCHED_RR scheduling class) for the process as its defined via _high_priority_processes parameter.

About the LGWR process, and it is set to TS (SCHED_OTHER) class and it has no priority class attached to it.

Let’s change the priority and reboot the database to persistent the change!

At the same time I can see the same was logged into the Alert log file.

So, we have reniced the priority of LGWR on the system, I mean the higher value of priority actually makes the process lower priority; it means the process demands fewer system resources (and therefore is a “nicer” process). Now lets check the scheduling class of the process at the OS, it should be now changed to RR from TS.

Let me check at the OS Level what has changed now.

So, when nothing was working for us, this workaround helped and we were able to reduce LFS waits by more than 80% …

Hope It Helped!Prashant Dixit

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